In the United States alone, there are six companies actively involved in the spaceflight sector: Stratolaunch Systems, Planetary Resources, Blue Origin, Virgin Galactic, SpaceX, and Bigelow Aerospace. Investors include Paul Allen, Larry Page, Eric E. Schmidt, Ram Shriram, Charles Simony, Ross Perot Jr., Jeff Bezos, Richard Branson, Elon Musk, and Robert Bigelow.
